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   1 /*
   2  *  acpi_osl.c - OS-dependent functions ($Revision: 83 $)
   3  *
   4  *  Copyright (C) 2000       Andrew Henroid
   5  *  Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
   6  *  Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
   7  *
   8  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   9  *
  10  *  This program is free software; you can redistribute it and/or modify
  11  *  it under the terms of the GNU General Public License as published by
  12  *  the Free Software Foundation; either version 2 of the License, or
  13  *  (at your option) any later version.
  14  *
  15  *  This program is distributed in the hope that it will be useful,
  16  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  *  GNU General Public License for more details.
  19  *
  20  *  You should have received a copy of the GNU General Public License
  21  *  along with this program; if not, write to the Free Software
  22  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  23  *
  24  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  25  *
  26  */
  27
  28 #include <linux/module.h>
  29 #include <linux/kernel.h>
  30 #include <linux/slab.h>
  31 #include <linux/mm.h>
  32 #include <linux/pci.h>
  33 #include <linux/interrupt.h>
  34 #include <linux/kmod.h>
  35 #include <linux/delay.h>
  36 #include <linux/dmi.h>
  37 #include <linux/workqueue.h>
  38 #include <linux/nmi.h>
  39 #include <linux/acpi.h>
  40 #include <acpi/acpi.h>
  41 #include <asm/io.h>
  42 #include <acpi/acpi_bus.h>
  43 #include <acpi/processor.h>
  44 #include <asm/uaccess.h>
  45
  46 #include <linux/efi.h>
  47
  48 #define _COMPONENT              ACPI_OS_SERVICES
  49 ACPI_MODULE_NAME("osl");
  50 #define PREFIX          "ACPI: "
  51 struct acpi_os_dpc {
  52         acpi_osd_exec_callback function;
  53         void *context;
  54         struct work_struct work;
  55 };
  56
  57 #ifdef CONFIG_ACPI_CUSTOM_DSDT
  58 #include CONFIG_ACPI_CUSTOM_DSDT_FILE
  59 #endif
  60
  61 #ifdef ENABLE_DEBUGGER
  62 #include <linux/kdb.h>
  63
  64 /* stuff for debugger support */
  65 int acpi_in_debugger;
  66 EXPORT_SYMBOL(acpi_in_debugger);
  67
  68 extern char line_buf[80];
  69 #endif                          /*ENABLE_DEBUGGER */
  70
  71 static unsigned int acpi_irq_irq;
  72 static acpi_osd_handler acpi_irq_handler;
  73 static void *acpi_irq_context;
  74 static struct workqueue_struct *kacpid_wq;
  75 static struct workqueue_struct *kacpi_notify_wq;
  76
  77 #define OSI_STRING_LENGTH_MAX 64        /* arbitrary */
  78 static char osi_additional_string[OSI_STRING_LENGTH_MAX];
  79
  80 static int osi_linux;           /* disable _OSI(Linux) by default */
  81
  82 #ifdef CONFIG_DMI
  83 static struct __initdata dmi_system_id acpi_osl_dmi_table[];
  84 #endif
  85
  86 static void __init acpi_request_region (struct acpi_generic_address *addr,
  87         unsigned int length, char *desc)
  88 {
  89         struct resource *res;
  90
  91         if (!addr->address || !length)
  92                 return;
  93
  94         if (addr->space_id == ACPI_ADR_SPACE_SYSTEM_IO)
  95                 res = request_region(addr->address, length, desc);
  96         else if (addr->space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY)
  97                 res = request_mem_region(addr->address, length, desc);
  98 }
  99
 100 static int __init acpi_reserve_resources(void)
 101 {
 102         acpi_request_region(&acpi_gbl_FADT.xpm1a_event_block, acpi_gbl_FADT.pm1_event_length,
 103                 "ACPI PM1a_EVT_BLK");
 104
 105         acpi_request_region(&acpi_gbl_FADT.xpm1b_event_block, acpi_gbl_FADT.pm1_event_length,
 106                 "ACPI PM1b_EVT_BLK");
 107
 108         acpi_request_region(&acpi_gbl_FADT.xpm1a_control_block, acpi_gbl_FADT.pm1_control_length,
 109                 "ACPI PM1a_CNT_BLK");
 110
 111         acpi_request_region(&acpi_gbl_FADT.xpm1b_control_block, acpi_gbl_FADT.pm1_control_length,
 112                 "ACPI PM1b_CNT_BLK");
 113
 114         if (acpi_gbl_FADT.pm_timer_length == 4)
 115                 acpi_request_region(&acpi_gbl_FADT.xpm_timer_block, 4, "ACPI PM_TMR");
 116
 117         acpi_request_region(&acpi_gbl_FADT.xpm2_control_block, acpi_gbl_FADT.pm2_control_length,
 118                 "ACPI PM2_CNT_BLK");
 119
 120         /* Length of GPE blocks must be a non-negative multiple of 2 */
 121
 122         if (!(acpi_gbl_FADT.gpe0_block_length & 0x1))
 123                 acpi_request_region(&acpi_gbl_FADT.xgpe0_block,
 124                                acpi_gbl_FADT.gpe0_block_length, "ACPI GPE0_BLK");
 125
 126         if (!(acpi_gbl_FADT.gpe1_block_length & 0x1))
 127                 acpi_request_region(&acpi_gbl_FADT.xgpe1_block,
 128                                acpi_gbl_FADT.gpe1_block_length, "ACPI GPE1_BLK");
 129
 130         return 0;
 131 }
 132 device_initcall(acpi_reserve_resources);
 133
 134 acpi_status __init acpi_os_initialize(void)
 135 {
 136         dmi_check_system(acpi_osl_dmi_table);
 137         return AE_OK;
 138 }
 139
 140 acpi_status acpi_os_initialize1(void)
 141 {
 142         /*
 143          * Initialize PCI configuration space access, as we'll need to access
 144          * it while walking the namespace (bus 0 and root bridges w/ _BBNs).
 145          */
 146         if (!raw_pci_ops) {
 147                 printk(KERN_ERR PREFIX
 148                        "Access to PCI configuration space unavailable\n");
 149                 return AE_NULL_ENTRY;
 150         }
 151         kacpid_wq = create_singlethread_workqueue("kacpid");
 152         kacpi_notify_wq = create_singlethread_workqueue("kacpi_notify");
 153         BUG_ON(!kacpid_wq);
 154         BUG_ON(!kacpi_notify_wq);
 155         return AE_OK;
 156 }
 157
 158 acpi_status acpi_os_terminate(void)
 159 {
 160         if (acpi_irq_handler) {
 161                 acpi_os_remove_interrupt_handler(acpi_irq_irq,
 162                                                  acpi_irq_handler);
 163         }
 164
 165         destroy_workqueue(kacpid_wq);
 166         destroy_workqueue(kacpi_notify_wq);
 167
 168         return AE_OK;
 169 }
 170
 171 void acpi_os_printf(const char *fmt, ...)
 172 {
 173         va_list args;
 174         va_start(args, fmt);
 175         acpi_os_vprintf(fmt, args);
 176         va_end(args);
 177 }
 178
 179 EXPORT_SYMBOL(acpi_os_printf);
 180
 181 void acpi_os_vprintf(const char *fmt, va_list args)
 182 {
 183         static char buffer[512];
 184
 185         vsprintf(buffer, fmt, args);
 186
 187 #ifdef ENABLE_DEBUGGER
 188         if (acpi_in_debugger) {
 189                 kdb_printf("%s", buffer);
 190         } else {
 191                 printk("%s", buffer);
 192         }
 193 #else
 194         printk("%s", buffer);
 195 #endif
 196 }
 197
 198 acpi_physical_address __init acpi_os_get_root_pointer(void)
 199 {
 200         if (efi_enabled) {
 201                 if (efi.acpi20 != EFI_INVALID_TABLE_ADDR)
 202                         return efi.acpi20;
 203                 else if (efi.acpi != EFI_INVALID_TABLE_ADDR)
 204                         return efi.acpi;
 205                 else {
 206                         printk(KERN_ERR PREFIX
 207                                "System description tables not found\n");
 208                         return 0;
 209                 }
 210         } else
 211                 return acpi_find_rsdp();
 212 }
 213
 214 void __iomem *acpi_os_map_memory(acpi_physical_address phys, acpi_size size)
 215 {
 216         if (phys > ULONG_MAX) {
 217                 printk(KERN_ERR PREFIX "Cannot map memory that high\n");
 218                 return NULL;
 219         }
 220         if (acpi_gbl_permanent_mmap)
 221                 /*
 222                 * ioremap checks to ensure this is in reserved space
 223                 */
 224                 return ioremap((unsigned long)phys, size);
 225         else
 226                 return __acpi_map_table((unsigned long)phys, size);
 227 }
 228 EXPORT_SYMBOL_GPL(acpi_os_map_memory);
 229
 230 void acpi_os_unmap_memory(void __iomem * virt, acpi_size size)
 231 {
 232         if (acpi_gbl_permanent_mmap) {
 233                 iounmap(virt);
 234         }
 235 }
 236 EXPORT_SYMBOL_GPL(acpi_os_unmap_memory);
 237
 238 #ifdef ACPI_FUTURE_USAGE
 239 acpi_status
 240 acpi_os_get_physical_address(void *virt, acpi_physical_address * phys)
 241 {
 242         if (!phys || !virt)
 243                 return AE_BAD_PARAMETER;
 244
 245         *phys = virt_to_phys(virt);
 246
 247         return AE_OK;
 248 }
 249 #endif
 250
 251 #define ACPI_MAX_OVERRIDE_LEN 100
 252
 253 static char acpi_os_name[ACPI_MAX_OVERRIDE_LEN];
 254
 255 acpi_status
 256 acpi_os_predefined_override(const struct acpi_predefined_names *init_val,
 257                             acpi_string * new_val)
 258 {
 259         if (!init_val || !new_val)
 260                 return AE_BAD_PARAMETER;
 261
 262         *new_val = NULL;
 263         if (!memcmp(init_val->name, "_OS_", 4) && strlen(acpi_os_name)) {
 264                 printk(KERN_INFO PREFIX "Overriding _OS definition to '%s'\n",
 265                        acpi_os_name);
 266                 *new_val = acpi_os_name;
 267         }
 268
 269         return AE_OK;
 270 }
 271
 272 acpi_status
 273 acpi_os_table_override(struct acpi_table_header * existing_table,
 274                        struct acpi_table_header ** new_table)
 275 {
 276         if (!existing_table || !new_table)
 277                 return AE_BAD_PARAMETER;
 278
 279 #ifdef CONFIG_ACPI_CUSTOM_DSDT
 280         if (strncmp(existing_table->signature, "DSDT", 4) == 0)
 281                 *new_table = (struct acpi_table_header *)AmlCode;
 282         else
 283                 *new_table = NULL;
 284 #else
 285         *new_table = NULL;
 286 #endif
 287         return AE_OK;
 288 }
 289
 290 static irqreturn_t acpi_irq(int irq, void *dev_id)
 291 {
 292         return (*acpi_irq_handler) (acpi_irq_context) ? IRQ_HANDLED : IRQ_NONE;
 293 }
 294
 295 acpi_status
 296 acpi_os_install_interrupt_handler(u32 gsi, acpi_osd_handler handler,
 297                                   void *context)
 298 {
 299         unsigned int irq;
 300
 301         /*
 302          * Ignore the GSI from the core, and use the value in our copy of the
 303          * FADT. It may not be the same if an interrupt source override exists
 304          * for the SCI.
 305          */
 306         gsi = acpi_gbl_FADT.sci_interrupt;
 307         if (acpi_gsi_to_irq(gsi, &irq) < 0) {
 308                 printk(KERN_ERR PREFIX "SCI (ACPI GSI %d) not registered\n",
 309                        gsi);
 310                 return AE_OK;
 311         }
 312
 313         acpi_irq_handler = handler;
 314         acpi_irq_context = context;
 315         if (request_irq(irq, acpi_irq, IRQF_SHARED, "acpi", acpi_irq)) {
 316                 printk(KERN_ERR PREFIX "SCI (IRQ%d) allocation failed\n", irq);
 317                 return AE_NOT_ACQUIRED;
 318         }
 319         acpi_irq_irq = irq;
 320
 321         return AE_OK;
 322 }
 323
 324 acpi_status acpi_os_remove_interrupt_handler(u32 irq, acpi_osd_handler handler)
 325 {
 326         if (irq) {
 327                 free_irq(irq, acpi_irq);
 328                 acpi_irq_handler = NULL;
 329                 acpi_irq_irq = 0;
 330         }
 331
 332         return AE_OK;
 333 }
 334
 335 /*
 336  * Running in interpreter thread context, safe to sleep
 337  */
 338
 339 void acpi_os_sleep(acpi_integer ms)
 340 {
 341         schedule_timeout_interruptible(msecs_to_jiffies(ms));
 342 }
 343
 344 EXPORT_SYMBOL(acpi_os_sleep);
 345
 346 void acpi_os_stall(u32 us)
 347 {
 348         while (us) {
 349                 u32 delay = 1000;
 350
 351                 if (delay > us)
 352                         delay = us;
 353                 udelay(delay);
 354                 touch_nmi_watchdog();
 355                 us -= delay;
 356         }
 357 }
 358
 359 EXPORT_SYMBOL(acpi_os_stall);
 360
 361 /*
 362  * Support ACPI 3.0 AML Timer operand
 363  * Returns 64-bit free-running, monotonically increasing timer
 364  * with 100ns granularity
 365  */
 366 u64 acpi_os_get_timer(void)
 367 {
 368         static u64 t;
 369
 370 #ifdef  CONFIG_HPET
 371         /* TBD: use HPET if available */
 372 #endif
 373
 374 #ifdef  CONFIG_X86_PM_TIMER
 375         /* TBD: default to PM timer if HPET was not available */
 376 #endif
 377         if (!t)
 378                 printk(KERN_ERR PREFIX "acpi_os_get_timer() TBD\n");
 379
 380         return ++t;
 381 }
 382
 383 acpi_status acpi_os_read_port(acpi_io_address port, u32 * value, u32 width)
 384 {
 385         u32 dummy;
 386
 387         if (!value)
 388                 value = &dummy;
 389
 390         switch (width) {
 391         case 8:
 392                 *(u8 *) value = inb(port);
 393                 break;
 394         case 16:
 395                 *(u16 *) value = inw(port);
 396                 break;
 397         case 32:
 398                 *(u32 *) value = inl(port);
 399                 break;
 400         default:
 401                 BUG();
 402         }
 403
 404         return AE_OK;
 405 }
 406
 407 EXPORT_SYMBOL(acpi_os_read_port);
 408
 409 acpi_status acpi_os_write_port(acpi_io_address port, u32 value, u32 width)
 410 {
 411         switch (width) {
 412         case 8:
 413                 outb(value, port);
 414                 break;
 415         case 16:
 416                 outw(value, port);
 417                 break;
 418         case 32:
 419                 outl(value, port);
 420                 break;
 421         default:
 422                 BUG();
 423         }
 424
 425         return AE_OK;
 426 }
 427
 428 EXPORT_SYMBOL(acpi_os_write_port);
 429
 430 acpi_status
 431 acpi_os_read_memory(acpi_physical_address phys_addr, u32 * value, u32 width)
 432 {
 433         u32 dummy;
 434         void __iomem *virt_addr;
 435
 436         virt_addr = ioremap(phys_addr, width);
 437         if (!value)
 438                 value = &dummy;
 439
 440         switch (width) {
 441         case 8:
 442                 *(u8 *) value = readb(virt_addr);
 443                 break;
 444         case 16:
 445                 *(u16 *) value = readw(virt_addr);
 446                 break;
 447         case 32:
 448                 *(u32 *) value = readl(virt_addr);
 449                 break;
 450         default:
 451                 BUG();
 452         }
 453
 454         iounmap(virt_addr);
 455
 456         return AE_OK;
 457 }
 458
 459 acpi_status
 460 acpi_os_write_memory(acpi_physical_address phys_addr, u32 value, u32 width)
 461 {
 462         void __iomem *virt_addr;
 463
 464         virt_addr = ioremap(phys_addr, width);
 465
 466         switch (width) {
 467         case 8:
 468                 writeb(value, virt_addr);
 469                 break;
 470         case 16:
 471                 writew(value, virt_addr);
 472                 break;
 473         case 32:
 474                 writel(value, virt_addr);
 475                 break;
 476         default:
 477                 BUG();
 478         }
 479
 480         iounmap(virt_addr);
 481
 482         return AE_OK;
 483 }
 484
 485 acpi_status
 486 acpi_os_read_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
 487                                void *value, u32 width)
 488 {
 489         int result, size;
 490
 491         if (!value)
 492                 return AE_BAD_PARAMETER;
 493
 494         switch (width) {
 495         case 8:
 496                 size = 1;
 497                 break;
 498         case 16:
 499                 size = 2;
 500                 break;
 501         case 32:
 502                 size = 4;
 503                 break;
 504         default:
 505                 return AE_ERROR;
 506         }
 507
 508         BUG_ON(!raw_pci_ops);
 509
 510         result = raw_pci_ops->read(pci_id->segment, pci_id->bus,
 511                                    PCI_DEVFN(pci_id->device, pci_id->function),
 512                                    reg, size, value);
 513
 514         return (result ? AE_ERROR : AE_OK);
 515 }
 516
 517 EXPORT_SYMBOL(acpi_os_read_pci_configuration);
 518
 519 acpi_status
 520 acpi_os_write_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
 521                                 acpi_integer value, u32 width)
 522 {
 523         int result, size;
 524
 525         switch (width) {
 526         case 8:
 527                 size = 1;
 528                 break;
 529         case 16:
 530                 size = 2;
 531                 break;
 532         case 32:
 533                 size = 4;
 534                 break;
 535         default:
 536                 return AE_ERROR;
 537         }
 538
 539         BUG_ON(!raw_pci_ops);
 540
 541         result = raw_pci_ops->write(pci_id->segment, pci_id->bus,
 542                                     PCI_DEVFN(pci_id->device, pci_id->function),
 543                                     reg, size, value);
 544
 545         return (result ? AE_ERROR : AE_OK);
 546 }
 547
 548 /* TODO: Change code to take advantage of driver model more */
 549 static void acpi_os_derive_pci_id_2(acpi_handle rhandle,        /* upper bound  */
 550                                     acpi_handle chandle,        /* current node */
 551                                     struct acpi_pci_id **id,
 552                                     int *is_bridge, u8 * bus_number)
 553 {
 554         acpi_handle handle;
 555         struct acpi_pci_id *pci_id = *id;
 556         acpi_status status;
 557         unsigned long temp;
 558         acpi_object_type type;
 559         u8 tu8;
 560
 561         acpi_get_parent(chandle, &handle);
 562         if (handle != rhandle) {
 563                 acpi_os_derive_pci_id_2(rhandle, handle, &pci_id, is_bridge,
 564                                         bus_number);
 565
 566                 status = acpi_get_type(handle, &type);
 567                 if ((ACPI_FAILURE(status)) || (type != ACPI_TYPE_DEVICE))
 568                         return;
 569
 570                 status =
 571                     acpi_evaluate_integer(handle, METHOD_NAME__ADR, NULL,
 572                                           &temp);
 573                 if (ACPI_SUCCESS(status)) {
 574                         pci_id->device = ACPI_HIWORD(ACPI_LODWORD(temp));
 575                         pci_id->function = ACPI_LOWORD(ACPI_LODWORD(temp));
 576
 577                         if (*is_bridge)
 578                                 pci_id->bus = *bus_number;
 579
 580                         /* any nicer way to get bus number of bridge ? */
 581                         status =
 582                             acpi_os_read_pci_configuration(pci_id, 0x0e, &tu8,
 583                                                            8);
 584                         if (ACPI_SUCCESS(status)
 585                             && ((tu8 & 0x7f) == 1 || (tu8 & 0x7f) == 2)) {
 586                                 status =
 587                                     acpi_os_read_pci_configuration(pci_id, 0x18,
 588                                                                    &tu8, 8);
 589                                 if (!ACPI_SUCCESS(status)) {
 590                                         /* Certainly broken...  FIX ME */
 591                                         return;
 592                                 }
 593                                 *is_bridge = 1;
 594                                 pci_id->bus = tu8;
 595                                 status =
 596                                     acpi_os_read_pci_configuration(pci_id, 0x19,
 597                                                                    &tu8, 8);
 598                                 if (ACPI_SUCCESS(status)) {
 599                                         *bus_number = tu8;
 600                                 }
 601                         } else
 602                                 *is_bridge = 0;
 603                 }
 604         }
 605 }
 606
 607 void acpi_os_derive_pci_id(acpi_handle rhandle, /* upper bound  */
 608                            acpi_handle chandle, /* current node */
 609                            struct acpi_pci_id **id)
 610 {
 611         int is_bridge = 1;
 612         u8 bus_number = (*id)->bus;
 613
 614         acpi_os_derive_pci_id_2(rhandle, chandle, id, &is_bridge, &bus_number);
 615 }
 616
 617 static void acpi_os_execute_deferred(struct work_struct *work)
 618 {
 619         struct acpi_os_dpc *dpc = container_of(work, struct acpi_os_dpc, work);
 620         if (!dpc) {
 621                 printk(KERN_ERR PREFIX "Invalid (NULL) context\n");
 622                 return;
 623         }
 624
 625         dpc->function(dpc->context);
 626         kfree(dpc);
 627
 628         /* Yield cpu to notify thread */
 629         cond_resched();
 630
 631         return;
 632 }
 633
 634 static void acpi_os_execute_notify(struct work_struct *work)
 635 {
 636         struct acpi_os_dpc *dpc = container_of(work, struct acpi_os_dpc, work);
 637
 638         if (!dpc) {
 639                 printk(KERN_ERR PREFIX "Invalid (NULL) context\n");
 640                 return;
 641         }
 642
 643         dpc->function(dpc->context);
 644
 645         kfree(dpc);
 646
 647         return;
 648 }
 649
 650 /*******************************************************************************
 651  *
 652  * FUNCTION:    acpi_os_execute
 653  *
 654  * PARAMETERS:  Type               - Type of the callback
 655  *              Function           - Function to be executed
 656  *              Context            - Function parameters
 657  *
 658  * RETURN:      Status
 659  *
 660  * DESCRIPTION: Depending on type, either queues function for deferred execution or
 661  *              immediately executes function on a separate thread.
 662  *
 663  ******************************************************************************/
 664
 665 acpi_status acpi_os_execute(acpi_execute_type type,
 666                             acpi_osd_exec_callback function, void *context)
 667 {
 668         acpi_status status = AE_OK;
 669         struct acpi_os_dpc *dpc;
 670
 671         ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 672                           "Scheduling function [%p(%p)] for deferred execution.\n",
 673                           function, context));
 674
 675         if (!function)
 676                 return AE_BAD_PARAMETER;
 677
 678         /*
 679          * Allocate/initialize DPC structure.  Note that this memory will be
 680          * freed by the callee.  The kernel handles the work_struct list  in a
 681          * way that allows us to also free its memory inside the callee.
 682          * Because we may want to schedule several tasks with different
 683          * parameters we can't use the approach some kernel code uses of
 684          * having a static work_struct.
 685          */
 686
 687         dpc = kmalloc(sizeof(struct acpi_os_dpc), GFP_ATOMIC);
 688         if (!dpc)
 689                 return_ACPI_STATUS(AE_NO_MEMORY);
 690
 691         dpc->function = function;
 692         dpc->context = context;
 693
 694         if (type == OSL_NOTIFY_HANDLER) {
 695                 INIT_WORK(&dpc->work, acpi_os_execute_notify);
 696                 if (!queue_work(kacpi_notify_wq, &dpc->work)) {
 697                         status = AE_ERROR;
 698                         kfree(dpc);
 699                 }
 700         } else {
 701                 INIT_WORK(&dpc->work, acpi_os_execute_deferred);
 702                 if (!queue_work(kacpid_wq, &dpc->work)) {
 703                         ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 704                                   "Call to queue_work() failed.\n"));
 705                         status = AE_ERROR;
 706                         kfree(dpc);
 707                 }
 708         }
 709         return_ACPI_STATUS(status);
 710 }
 711
 712 EXPORT_SYMBOL(acpi_os_execute);
 713
 714 void acpi_os_wait_events_complete(void *context)
 715 {
 716         flush_workqueue(kacpid_wq);
 717 }
 718
 719 EXPORT_SYMBOL(acpi_os_wait_events_complete);
 720
 721 /*
 722  * Allocate the memory for a spinlock and initialize it.
 723  */
 724 acpi_status acpi_os_create_lock(acpi_spinlock * handle)
 725 {
 726         spin_lock_init(*handle);
 727
 728         return AE_OK;
 729 }
 730
 731 /*
 732  * Deallocate the memory for a spinlock.
 733  */
 734 void acpi_os_delete_lock(acpi_spinlock handle)
 735 {
 736         return;
 737 }
 738
 739 acpi_status
 740 acpi_os_create_semaphore(u32 max_units, u32 initial_units, acpi_handle * handle)
 741 {
 742         struct semaphore *sem = NULL;
 743
 744
 745         sem = acpi_os_allocate(sizeof(struct semaphore));
 746         if (!sem)
 747                 return AE_NO_MEMORY;
 748         memset(sem, 0, sizeof(struct semaphore));
 749
 750         sema_init(sem, initial_units);
 751
 752         *handle = (acpi_handle *) sem;
 753
 754         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Creating semaphore[%p|%d].\n",
 755                           *handle, initial_units));
 756
 757         return AE_OK;
 758 }
 759
 760 EXPORT_SYMBOL(acpi_os_create_semaphore);
 761
 762 /*
 763  * TODO: A better way to delete semaphores?  Linux doesn't have a
 764  * 'delete_semaphore()' function -- may result in an invalid
 765  * pointer dereference for non-synchronized consumers.  Should
 766  * we at least check for blocked threads and signal/cancel them?
 767  */
 768
 769 acpi_status acpi_os_delete_semaphore(acpi_handle handle)
 770 {
 771         struct semaphore *sem = (struct semaphore *)handle;
 772
 773
 774         if (!sem)
 775                 return AE_BAD_PARAMETER;
 776
 777         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Deleting semaphore[%p].\n", handle));
 778
 779         kfree(sem);
 780         sem = NULL;
 781
 782         return AE_OK;
 783 }
 784
 785 EXPORT_SYMBOL(acpi_os_delete_semaphore);
 786
 787 /*
 788  * TODO: The kernel doesn't have a 'down_timeout' function -- had to
 789  * improvise.  The process is to sleep for one scheduler quantum
 790  * until the semaphore becomes available.  Downside is that this
 791  * may result in starvation for timeout-based waits when there's
 792  * lots of semaphore activity.
 793  *
 794  * TODO: Support for units > 1?
 795  */
 796 acpi_status acpi_os_wait_semaphore(acpi_handle handle, u32 units, u16 timeout)
 797 {
 798         acpi_status status = AE_OK;
 799         struct semaphore *sem = (struct semaphore *)handle;
 800         int ret = 0;
 801
 802
 803         if (!sem || (units < 1))
 804                 return AE_BAD_PARAMETER;
 805
 806         if (units > 1)
 807                 return AE_SUPPORT;
 808
 809         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Waiting for semaphore[%p|%d|%d]\n",
 810                           handle, units, timeout));
 811
 812         /*
 813          * This can be called during resume with interrupts off.
 814          * Like boot-time, we should be single threaded and will
 815          * always get the lock if we try -- timeout or not.
 816          * If this doesn't succeed, then we will oops courtesy of
 817          * might_sleep() in down().
 818          */
 819         if (!down_trylock(sem))
 820                 return AE_OK;
 821
 822         switch (timeout) {
 823                 /*
 824                  * No Wait:
 825                  * --------
 826                  * A zero timeout value indicates that we shouldn't wait - just
 827                  * acquire the semaphore if available otherwise return AE_TIME
 828                  * (a.k.a. 'would block').
 829                  */
 830         case 0:
 831                 if (down_trylock(sem))
 832                         status = AE_TIME;
 833                 break;
 834
 835                 /*
 836                  * Wait Indefinitely:
 837                  * ------------------
 838                  */
 839         case ACPI_WAIT_FOREVER:
 840                 down(sem);
 841                 break;
 842
 843                 /*
 844                  * Wait w/ Timeout:
 845                  * ----------------
 846                  */
 847         default:
 848                 // TODO: A better timeout algorithm?
 849                 {
 850                         int i = 0;
 851                         static const int quantum_ms = 1000 / HZ;
 852
 853                         ret = down_trylock(sem);
 854                         for (i = timeout; (i > 0 && ret != 0); i -= quantum_ms) {
 855                                 schedule_timeout_interruptible(1);
 856                                 ret = down_trylock(sem);
 857                         }
 858
 859                         if (ret != 0)
 860                                 status = AE_TIME;
 861                 }
 862                 break;
 863         }
 864
 865         if (ACPI_FAILURE(status)) {
 866                 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
 867                                   "Failed to acquire semaphore[%p|%d|%d], %s",
 868                                   handle, units, timeout,
 869                                   acpi_format_exception(status)));
 870         } else {
 871                 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
 872                                   "Acquired semaphore[%p|%d|%d]", handle,
 873                                   units, timeout));
 874         }
 875
 876         return status;
 877 }
 878
 879 EXPORT_SYMBOL(acpi_os_wait_semaphore);
 880
 881 /*
 882  * TODO: Support for units > 1?
 883  */
 884 acpi_status acpi_os_signal_semaphore(acpi_handle handle, u32 units)
 885 {
 886         struct semaphore *sem = (struct semaphore *)handle;
 887
 888
 889         if (!sem || (units < 1))
 890                 return AE_BAD_PARAMETER;
 891
 892         if (units > 1)
 893                 return AE_SUPPORT;
 894
 895         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Signaling semaphore[%p|%d]\n", handle,
 896                           units));
 897
 898         up(sem);
 899
 900         return AE_OK;
 901 }
 902
 903 EXPORT_SYMBOL(acpi_os_signal_semaphore);
 904
 905 #ifdef ACPI_FUTURE_USAGE
 906 u32 acpi_os_get_line(char *buffer)
 907 {
 908
 909 #ifdef ENABLE_DEBUGGER
 910         if (acpi_in_debugger) {
 911                 u32 chars;
 912
 913                 kdb_read(buffer, sizeof(line_buf));
 914
 915                 /* remove the CR kdb includes */
 916                 chars = strlen(buffer) - 1;
 917                 buffer[chars] = '\0';
 918         }
 919 #endif
 920
 921         return 0;
 922 }
 923 #endif                          /*  ACPI_FUTURE_USAGE  */
 924
 925 acpi_status acpi_os_signal(u32 function, void *info)
 926 {
 927         switch (function) {
 928         case ACPI_SIGNAL_FATAL:
 929                 printk(KERN_ERR PREFIX "Fatal opcode executed\n");
 930                 break;
 931         case ACPI_SIGNAL_BREAKPOINT:
 932                 /*
 933                  * AML Breakpoint
 934                  * ACPI spec. says to treat it as a NOP unless
 935                  * you are debugging.  So if/when we integrate
 936                  * AML debugger into the kernel debugger its
 937                  * hook will go here.  But until then it is
 938                  * not useful to print anything on breakpoints.
 939                  */
 940                 break;
 941         default:
 942                 break;
 943         }
 944
 945         return AE_OK;
 946 }
 947
 948 EXPORT_SYMBOL(acpi_os_signal);
 949
 950 static int __init acpi_os_name_setup(char *str)
 951 {
 952         char *p = acpi_os_name;
 953         int count = ACPI_MAX_OVERRIDE_LEN - 1;
 954
 955         if (!str || !*str)
 956                 return 0;
 957
 958         for (; count-- && str && *str; str++) {
 959                 if (isalnum(*str) || *str == ' ' || *str == ':')
 960                         *p++ = *str;
 961                 else if (*str == '\'' || *str == '"')
 962                         continue;
 963                 else
 964                         break;
 965         }
 966         *p = 0;
 967
 968         return 1;
 969
 970 }
 971
 972 __setup("acpi_os_name=", acpi_os_name_setup);
 973
 974 static void enable_osi_linux(int enable) {
 975
 976         if (osi_linux != enable)
 977                 printk(KERN_INFO PREFIX "%sabled _OSI(Linux)\n",
 978                         enable ? "En": "Dis");
 979
 980         osi_linux = enable;
 981         return;
 982 }
 983
 984 /*
 985  * Modify the list of "OS Interfaces" reported to BIOS via _OSI
 986  *
 987  * empty string disables _OSI
 988  * string starting with '!' disables that string
 989  * otherwise string is added to list, augmenting built-in strings
 990  */
 991 static int __init acpi_osi_setup(char *str)
 992 {
 993         if (str == NULL || *str == '\0') {
 994                 printk(KERN_INFO PREFIX "_OSI method disabled\n");
 995                 acpi_gbl_create_osi_method = FALSE;
 996         } else if (!strcmp("!Linux", str)) {
 997                 enable_osi_linux(0);
 998         } else if (*str == '!') {
 999                 if (acpi_osi_invalidate(++str) == AE_OK)
1000                         printk(KERN_INFO PREFIX "Deleted _OSI(%s)\n", str);
1001         } else if (!strcmp("Linux", str)) {
1002                 enable_osi_linux(1);
1003         } else if (*osi_additional_string == '\0') {
1004                 strncpy(osi_additional_string, str, OSI_STRING_LENGTH_MAX);
1005                 printk(KERN_INFO PREFIX "Added _OSI(%s)\n", str);
1006         }
1007
1008         return 1;
1009 }
1010
1011 __setup("acpi_osi=", acpi_osi_setup);
1012
1013 /* enable serialization to combat AE_ALREADY_EXISTS errors */
1014 static int __init acpi_serialize_setup(char *str)
1015 {
1016         printk(KERN_INFO PREFIX "serialize enabled\n");
1017
1018         acpi_gbl_all_methods_serialized = TRUE;
1019
1020         return 1;
1021 }
1022
1023 __setup("acpi_serialize", acpi_serialize_setup);
1024
1025 /*
1026  * Wake and Run-Time GPES are expected to be separate.
1027  * We disable wake-GPEs at run-time to prevent spurious
1028  * interrupts.
1029  *
1030  * However, if a system exists that shares Wake and
1031  * Run-time events on the same GPE this flag is available
1032  * to tell Linux to keep the wake-time GPEs enabled at run-time.
1033  */
1034 static int __init acpi_wake_gpes_always_on_setup(char *str)
1035 {
1036         printk(KERN_INFO PREFIX "wake GPEs not disabled\n");
1037
1038         acpi_gbl_leave_wake_gpes_disabled = FALSE;
1039
1040         return 1;
1041 }
1042
1043 __setup("acpi_wake_gpes_always_on", acpi_wake_gpes_always_on_setup);
1044
1045 /*
1046  * Acquire a spinlock.
1047  *
1048  * handle is a pointer to the spinlock_t.
1049  */
1050
1051 acpi_cpu_flags acpi_os_acquire_lock(acpi_spinlock lockp)
1052 {
1053         acpi_cpu_flags flags;
1054         spin_lock_irqsave(lockp, flags);
1055         return flags;
1056 }
1057
1058 /*
1059  * Release a spinlock. See above.
1060  */
1061
1062 void acpi_os_release_lock(acpi_spinlock lockp, acpi_cpu_flags flags)
1063 {
1064         spin_unlock_irqrestore(lockp, flags);
1065 }
1066
1067 #ifndef ACPI_USE_LOCAL_CACHE
1068
1069 /*******************************************************************************
1070  *
1071  * FUNCTION:    acpi_os_create_cache
1072  *
1073  * PARAMETERS:  name      - Ascii name for the cache
1074  *              size      - Size of each cached object
1075  *              depth     - Maximum depth of the cache (in objects) <ignored>
1076  *              cache     - Where the new cache object is returned
1077  *
1078  * RETURN:      status
1079  *
1080  * DESCRIPTION: Create a cache object
1081  *
1082  ******************************************************************************/
1083
1084 acpi_status
1085 acpi_os_create_cache(char *name, u16 size, u16 depth, acpi_cache_t ** cache)
1086 {
1087         *cache = kmem_cache_create(name, size, 0, 0, NULL);
1088         if (*cache == NULL)
1089                 return AE_ERROR;
1090         else
1091                 return AE_OK;
1092 }
1093
1094 /*******************************************************************************
1095  *
1096  * FUNCTION:    acpi_os_purge_cache
1097  *
1098  * PARAMETERS:  Cache           - Handle to cache object
1099  *
1100  * RETURN:      Status
1101  *
1102  * DESCRIPTION: Free all objects within the requested cache.
1103  *
1104  ******************************************************************************/
1105
1106 acpi_status acpi_os_purge_cache(acpi_cache_t * cache)
1107 {
1108         kmem_cache_shrink(cache);
1109         return (AE_OK);
1110 }
1111
1112 /*******************************************************************************
1113  *
1114  * FUNCTION:    acpi_os_delete_cache
1115  *
1116  * PARAMETERS:  Cache           - Handle to cache object
1117  *
1118  * RETURN:      Status
1119  *
1120  * DESCRIPTION: Free all objects within the requested cache and delete the
1121  *              cache object.
1122  *
1123  ******************************************************************************/
1124
1125 acpi_status acpi_os_delete_cache(acpi_cache_t * cache)
1126 {
1127         kmem_cache_destroy(cache);
1128         return (AE_OK);
1129 }
1130
1131 /*******************************************************************************
1132  *
1133  * FUNCTION:    acpi_os_release_object
1134  *
1135  * PARAMETERS:  Cache       - Handle to cache object
1136  *              Object      - The object to be released
1137  *
1138  * RETURN:      None
1139  *
1140  * DESCRIPTION: Release an object to the specified cache.  If cache is full,
1141  *              the object is deleted.
1142  *
1143  ******************************************************************************/
1144
1145 acpi_status acpi_os_release_object(acpi_cache_t * cache, void *object)
1146 {
1147         kmem_cache_free(cache, object);
1148         return (AE_OK);
1149 }
1150
1151 /******************************************************************************
1152  *
1153  * FUNCTION:    acpi_os_validate_interface
1154  *
1155  * PARAMETERS:  interface           - Requested interface to be validated
1156  *
1157  * RETURN:      AE_OK if interface is supported, AE_SUPPORT otherwise
1158  *
1159  * DESCRIPTION: Match an interface string to the interfaces supported by the
1160  *              host. Strings originate from an AML call to the _OSI method.
1161  *
1162  *****************************************************************************/
1163
1164 acpi_status
1165 acpi_os_validate_interface (char *interface)
1166 {
1167         if (!strncmp(osi_additional_string, interface, OSI_STRING_LENGTH_MAX))
1168                 return AE_OK;
1169         if (!strcmp("Linux", interface)) {
1170                 printk(KERN_WARNING PREFIX
1171                         "System BIOS is requesting _OSI(Linux)\n");
1172                 printk(KERN_WARNING PREFIX
1173                         "If \"acpi_osi=Linux\" works better,\n"
1174                         "Please send dmidecode "
1175                         "to linux-acpi@vger.kernel.org\n");
1176                 if(osi_linux)
1177                         return AE_OK;
1178         }
1179         return AE_SUPPORT;
1180 }
1181
1182 /******************************************************************************
1183  *
1184  * FUNCTION:    acpi_os_validate_address
1185  *
1186  * PARAMETERS:  space_id             - ACPI space ID
1187  *              address             - Physical address
1188  *              length              - Address length
1189  *
1190  * RETURN:      AE_OK if address/length is valid for the space_id. Otherwise,
1191  *              should return AE_AML_ILLEGAL_ADDRESS.
1192  *
1193  * DESCRIPTION: Validate a system address via the host OS. Used to validate
1194  *              the addresses accessed by AML operation regions.
1195  *
1196  *****************************************************************************/
1197
1198 acpi_status
1199 acpi_os_validate_address (
1200     u8                   space_id,
1201     acpi_physical_address   address,
1202     acpi_size               length)
1203 {
1204
1205     return AE_OK;
1206 }
1207
1208 #ifdef CONFIG_DMI
1209 static int dmi_osi_linux(const struct dmi_system_id *d)
1210 {
1211         printk(KERN_NOTICE "%s detected: enabling _OSI(Linux)\n", d->ident);
1212         enable_osi_linux(1);
1213         return 0;
1214 }
1215
1216 static struct dmi_system_id acpi_osl_dmi_table[] __initdata = {
1217         /*
1218          * Boxes that need _OSI(Linux)
1219          */
1220         {
1221          .callback = dmi_osi_linux,
1222          .ident = "Intel Napa CRB",
1223          .matches = {
1224                      DMI_MATCH(DMI_BOARD_VENDOR, "Intel Corporation"),
1225                      DMI_MATCH(DMI_BOARD_NAME, "MPAD-MSAE Customer Reference Boards"),
1226                      },
1227          },
1228         {}
1229 };
1230 #endif /* CONFIG_DMI */
1231
1232 #endif